State Bank Of India — Education loan repayment

I have availed education loan from the SBI nagalapuram(4724) AP, in 2009. I have got notice from the head office Tirupati in november 2014 to repay the amount with in 60 days. I went and contacted my branch manager regarding this, to extend the time limit so that i can pay the amount, but the branch manager is not all listening to my words, so i wrote a letter and gave . After few days i got call from the Tirupati branch to repay the amount and i asked them, its not possible to pay the full amount so they asked us to pay sum of 47, 000. So we went to pay the amount in the branch, but our branch manger is not accepting the money, she is demanding me to pay full amount. but i payed the 50000 amount in the bank and came. But later she has issued the court notice, the thing is from tirupati branch they asked me to Rs. 50, 000, but why did they issue the court notice. But my branch is not all giving any explanation regarding this so please kindly help. Now what i should do with the court notice. I have to re pay Rs.3, 95, 000, in that i paid Rs.50, 000 as per the instruction received from the tirupati branch. I need some time so that i can repay in installments . please do the needful.